54
SCORE
D-Aspartic acid
Testosterone · Fertility · Athletic
Tier 3 — Trending
What it is
An amino acid that temporarily stimulates LH and testosterone production. The 2009 study showed a significant boost after 12 days, but larger trials in trained men found no benefit. May modestly help men with clinically low testosterone. Ineffective in healthy, trained adults. No serious side effects in published trials.
Efficacy
2/5
Safety
4/5
Research
2/5
Onset
2/5
Cost
3/5
Drug-int.
4/5
Dose
2–3 g/day for 2–3 months; only potentially useful in men with low testosterone; no benefit in trained athletes
Time of day & tips
Take in the morning with water. Cycle use — 2–3 months on, 1 month off. No benefit if your testosterone is already in the normal range.
Compare or learn more
Compare with another supplement →
Browse by symptom →
Open the full interactive view →